Δέ is related to δή as μέν to μήν. Δέ is a particle adversative, distinctive, disjunctive, but, moreover; it is much more frequent in the historical parts of the New Testament than in the other books, very rare in the Epistles of John and the Apocalypse. Δέ is used:
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Δὲ καὶ differs from καὶ δέ. In the latter, καὶ connects the whole member following it with what precedes; in the former καὶ, being augmentative or exaggerative, influence only the word immediately construed with it, and δὲ shows more evidently its relative sense without any ellipsis.
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This is the 28th edition of the Nestle-Aland Novum Testamentum Graece (NA28), a standard edition of the Greek New Testament used by New Testament scholars and Bible translators.
What's New In Nestle-Aland 28th Edition
Critical apparatus revised and easier to use .
Papyrii 117-127 included Study more .....

A collection of lessons for New Testament Greek. There are over 80 short lessons, each covering an aspect of verbs, nouns, etc. This is an audio recording of George Lovell Cary's An Introduction To The Greek of the New Testament.
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(1) PERIPHRASTIC FORM OF THE FUTURE. A Future tense composed of a Present Participle and the Future of the verb eivmi, is found occasionally in the New Testament. The force is that of a Progressive Future, with the thought of continuance or customariness somewhat emphasized.
Luke 5:10; ἀνθρώπους Study more .....